US3389080A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Treatment of ion-exchange resins
Assignee: Permutit Co Ltd
•
Filing: 1965-05-03
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Granted: 1968-06-18
•
Expires: 1985-05-03
Abstract
No abstract record available.
Inventors
- 👤 Arden Thomas Victor
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 08:35
CPC Classifications
B; B01; B01J; B01J49/00; B01J49/05; B01J49/09
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
44 words
A METHOD OF REGENERATING MIXED CATION-EXCHANGE AND ANION-EXCHANGE POWDERED RESINS PRESENT AS A LAYER ON A FILTER WHICH COMPRISIES SUCCESSIVELY PASSING THROUGH THE LAYER A SOLUTION OF AN ALKALI METAL SALT, A SOLUTION OF AN ALKALI METAL HYDROXIDE AND A SOLUTION OF AMMONIUM HYDROXIDE.
Claim 2
Independent Claim
44 words
A METHOD OF REGENERATING MIXED CATION-EXCHANGE AND ANION-EXCHANGE POWDERED RESINS PRESENT AS A LAYER ON A FILTER WHICH COMPRISIES SUCCESSIVELY PASSING THROUGH THE LAYER A SOLUTION OF AN ALKALI METAL SALT, A SOLUTION OF AN ALKALI METAL HYDROXIDE AND A SOLUTION OF AMMONIUM HYDROXIDE.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-06-18 | 1971-12-18 | 1972-06-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-06-18 | 1975-12-18 | 1976-06-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-06-18 | 1979-12-18 | 1980-06-18 | $7700.00 | Window Closed / Lapsed |